118,103 research outputs found
Effects of the elemental layer thickness on the properties of Fe/Co grown at 200 °C.
No full textThin Fe/Co multilayers were grown at 200 °C onto glass and naturally oxidized Si substrates, changing the elemental layer thickness. Onto glass substrates, the multilayers show a large in-plane uniaxialmagnetocrystalline anisotropy, which strengthens by increasing the Fe layer thickness. Onto naturally oxidized Si substrates, an appreciable out-of-plane contribution to the magnetization vector is present. This can be due to the absence in the
multilayer stack of a pure-Co layer as a consequence of a large intermixing occurring at the Fe/Co interfaces, that gives rise to a structure only constituted by intercalated Fe and FeCo layers. However, by increasing the Co and Fe layer thickness, the intermixing lowers because of a change in the sample morphology and microstructure, which determines the disappearance of the out-of-plane tilting of the magnetization vector while promoting the establishing of an in-plane anisotropy
Phase composition and morphology as a function of depth for boride coatings grown on Fe-Ni alloys
No full textConsiderable R&D efforts are being carried out in order to produce materials with satisfactory resistance to wear, corrosion or both. In many applications, in fact, the in-service life of components is determined by the surface properties. In the important field of thermochemical treatments of steels, based on diffusion of species such as carbon, nitrogen or boron, boriding is in a peculiar position. Indeed, coatings constituted by iron borides generally display very high hardness, even in excess of 20 GPa, as well as good wear resistance under both sliding and abrasive conditions. Borided steel components display excellent performance in several tribological applications in the mechanical engineering and automotive industries. In spite of several researches performed since many years, some problems remain to be solved as, in particular, the role of alloying elements in the steel on growth and properties of the boride coating.
In the present work the attention has been addressed to the role of Ni, investigated by boronizing binary alloys in order to avoid any interference by other alloying elements. Five Fe-Ni alloys with a Ni contents in the range from 11 to 80 wt.% were borided by a pack-cementation process, using a high boron potential powder mixture constituted by amorphous boron activated with 10 wt.% of potassium fluoborate. The thermochemical treatments were carried out at 850°C for exposure times up to 8 h.
Phase composition and morphology of the boride coatings were characterized as a function of depth by the layer-by-layer removal technique as well as by observations carried out on metallographic cross-sections, using different and complementary techniques: X-ray diffraction (XRD), Mossbauer spectroscopy (MS), micro-Raman spectroscopy, optical (OM) and scanning electron microscopy (SEM), Vickers microhardness measurements (MHV)
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Sarah L. Blum Author Visit - Warrior Nurse: PTSD and Healing
No full textHear Sarah L. Blum, author of Women Under Fire: Abuse in the Military, discuss her newest book, Warrior Nurse: PTSD and Healing followed by a Q&A and book signing.
Sarah L. Blum is a decorated Vietnam veteran who served as an operating room nurse during the intense fighting of 1967. In recognition of her service, she was awarded the Army Commendation Medal.
Sponsored by CWU Veterans Center and CWU Libraries.https://digitalcommons.cwu.edu/libraryevents/1252/thumbnail.jp
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